Morphine Equivalent Dose of Hydrocodone 10-325
A single hydrocodone 10 mg/acetaminophen 325 mg tablet equals 10 morphine milligram equivalents (MME). 1, 2
Conversion Calculation
- Hydrocodone has a 1.0 conversion factor to oral morphine equivalents according to CDC guidelines. 3, 2
- The calculation is straightforward: 10 mg hydrocodone × 1.0 = 10 MME. 3, 2
- This means hydrocodone is considered equipotent to oral morphine on a milligram-per-milligram basis for MME calculation purposes. 1, 3
Clinical Context for Opioid-Naïve Adults
- For an opioid-naïve adult, the National Comprehensive Cancer Network (NCCN) equianalgesic dosing table confirms that oral hydrocodone ≈ 30 mg is equivalent to oral morphine 30 mg. 1
- Therefore, a 10 mg hydrocodone dose represents approximately one-third of the standard reference dose (30 mg oral morphine equivalent). 1
- The initial dosing range for hydrocodone recommended by guidelines is 5-15 mg every 4-6 hours as needed, placing a 10 mg dose in the middle of this therapeutic range. 4
Important Caveats for Clinical Use
- These conversion factors are intended solely for risk assessment and MME calculation—they must never be used directly to determine the dose of a new opioid when switching medications. 1, 2
- When rotating from hydrocodone to another opioid, the calculated equianalgesic dose should be reduced by 25-50% to account for incomplete cross-tolerance. 1, 3, 2
- The acetaminophen component (325 mg) does not contribute to the MME calculation but must be tracked separately to avoid exceeding the maximum daily acetaminophen limit of 4 grams. 4
Dosing Safety Thresholds
- A single 10 mg hydrocodone tablet represents 10 MME, which is well below the 50 MME/day threshold where clinicians should pause and reassess benefit-risk balance. 2
- If a patient were taking this tablet every 4-6 hours (4-6 tablets daily), the total daily MME would be 40-60 MME/day, approaching or exceeding the 50 MME/day caution threshold. 2